Stove with float-operated shut-off valve



March 27, 1928. v H. c. HANso'N STOVE WITH P LOAT OPERATED SHUT-OFF 'VALVE Filed April 4. 19.27 2 sneetmeqz 1 OFF VALVE 2 Sheets-Sheat 2 H. c. HANSQN STOVE WITH FLOAT OPER'IED` SHUT- Flled April 4 1927 Matth' Z Patented Mar. 27, 1928.

HANS C. HANSON, 0F ALBERT LEA, MINNESOTA.

STOVE WITH FLOAT-OPERATED SHUT-OFF VALVE. v

Application filed April 4, 1927. SerialNm 180,780.

This invention relates to a stove adapted to use liquid vaporizing fuel such as gasoline, and while the device is applicable to various stoves of this type, it particularly is designed for such a stove which is assembled on a permanent and rigid frame. With 'such stoves as now generally constructed, liquid fuel is vaporized and suitablymixed with lair to form a combustible mixture which mixture is then supplied to the burners. The fuel is commonly fed from the fuel tank either by gravity or by having the fuel in the tank under pressure.l 1t is possible that the flame of the burners could be extinguished Without the supply of fuel being turned olf. If this should occur, the fuelpcontinuing to run to the burners would be vaporized and a combustible mixture would form about the stove. This would be dangerous as the same might be ignited and cause a damaging explosion. Itis desirable, therefore, to have some means for shutting off the supply of fuel from the fuel tank if .for any reason the burners of the stove should be extinguished.

It is an object1of this invention, therefore, to provide a simple and efficient means for shutting ofi' the supply of fuel from the fuel tank `if the flame should become extinguished without said supply of fuel being shut off at the tank.

It is vanother object of the invention to provide a structure of stove using liquid vaporizing fuel having means for collecting any unburned liquid fuel delivered to the- -stve and means operated by said unburned fuel for shutting off the supply of fuel at the source of fuel supply.

' It is a further object of the invention to provide a stove using liquid vaporizing fuel having a fuel supply conduit and a starting means for said stove to which fuel is supplied, together with means for collecting any fuel which might be delivered to said means when the stove is not lighted, and

automatic means for shutting olf the supply.

of fuel to said stove upon the accumulation of an appreciable amount of saidunburned fuel.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings, in which Fig. 4 is a vertical section taken on line 4-4 of Fig. 5;

Fig. 5 is a vertical section taken on line 5 5 of Fig. 1, said sections being taken'as indicated by the arrows;

Fig. l6 is a view partly in side elevation and partly in vertical cross section of the pump used.

Referring to the shown comprising a drawings, a stove is top plate 10 preferably made of sheet metal, the same being substantially of rectangular shape with rounded corners and having a downwardly extending peripheral flange as shown. The top plate 10 is supported upon a plurality of legs 11 shown as four in number and while these legs may be variously formed, in the embodiment of the inventlon illustrated they are shown as in the form of anglemembers. A casing 12 also preferably formed of sheet metal extends about three sides of the stove, said vcasing having inturned horizontal ianges at its to to which the topl plate 10 is secured by tiie 13. A pair of angle-shaped members 14 ex'- tend across the front of the stove between the front legs 11, immediatel under the top plate 10 and adjacent the ottom of casing 12 respectively. The topplate 10 has spaced openings 10a. A manifold 15 is secured to the portion of the'top plate 10 between the openlings 10a, by the headed and nutted bolts 16 extending through said to plate and lugs at the top of said manifold. y burners 17 disposed respectively beneath the openings 10a. Said manifold com rises a mixing chamber portion 15 into w ichair is admitted throughv the opening 15" in one side of said manifold. Said manifold'also has conduits15 leading from the mixing headed and nutted bolts aid manifold supports chamber to the burners 17. `The manifold/ 15 has a shallow pan 15 at itsupper side be-f continuing into said chamber and hav.

ing an opening 15g in the bottom thereof. A rod 15d is secured in one end of the manifold 15 and projects through one end of casing 12, assisting in supporting said manifold. The fuel is supplied to the mixing chamber 15a through a vaporizing tube 18 having ashut-of and regulating valve therein controlled by a hand wheel 19. The burner 17, remote from vaporizing tube 18, is controlled by a valve on rod 17a l from having an operatinghand wheel 17" thereon disposed at the front ofthe stove. The fuel for the stove is contained in a tank 20 and passes said tank through a conduit 21, said conduit passing through a valve member 22 to be later described, from which leads a conduit 25 which communicateswith the. under side of said vaporizing tube 18 as shown in Fig. 2.- The conduit 21 isl provided with a valve 24 equipped with a removable ,operating handle member 25, anda pressure gauge 26 extends from one side of the conduit 21 adapted to indicate the :pressure on the fuel in tank 20. The` tank 20 is also provided with a lling opening closed by a plug 27 having ahandle shown in'the shape of a star wheel. g The tank 20 also has al quantity or depth gauge 20a at one end and has a lug 20" bored and threaded to receive a ypump cylinder 28 in which moves a piston rod 28a secured thereto, movin through a ap 28b of the cylinder 28 and lilviaving an operating handle 28c at its outer end. The cylinder 28 is also provided with a relief passage 28d having a closing valve 28e. A small tube 28t extends from the relief passage 28d alongA the side of the cylinder 28 and communicates with the lower end thereof.l A check vvalve 30 is disposed at the bottom of cylinder 28, being held ,in place by a plug 31. A conduit 32 extends from conduit S23 and the vaporizing tube 18 below the The manifold 1.5 has a latter to a bracket 33, said bracket being bolted to the flange of the upper channel 14. The bracket 33 supports a small tube 3.4 se'- cured therein and projecting somewhatl loosely into an opening 35a in a Bunsen member 35, said member having a U-shaped pas# directed upwardly below the conduit 34.` A rod 36 also extends from bracket 33 to the member 35 for supporting the latter. It will be noted that the opening 35c `is also disposed below Vthe vaporizingtube 18 and above the pan 15. The tube 34 has a regulatingv valve therein carried ona-rod 34a operated by a hand wheel- 34". threaded aperture in its bottom,below opening 15g, lin which is secured a' vplug ,37.v Plug 37 has an open ended bore extending therein. and it will be vby handle 28.

tending into the bore thereof substantially. flush with the4 bottom of manifold 15. A

conduit 38 extends into one side of the plug 37 communicating with the bore thereofand is connected to one end of a float casing 39 secured to the rear wall of the casing 12 below the to of float 10. The casing 39 has a float chamlber therein in which is disposed the float 40. While this float may be of'various shapes in thel embodiment of the invention illustrated it is shownas in the form of a cylinder having a lug 40a at its top in which is secured a lever rod 41 extending to a block 42 pivoted on av pivot pin 43 extending transverselyof said casing. The block 42 has transverse and longitudinal intersectingslots in its upper side and the flattened end of the plunger 44 extends into the longitudinal slot therein, having trunnion pins 45 projecting at each side and disposed in the transverse slot in said block. The plunger 44 is rounded atone'endand slides in a bore in a block 46 into which is tlineaded an extension 22a from the lcasing of the valve 22, the end of the block 46 engaging one end of the float casing 39 and a jamb nut 47 being threaded .on the casing of thevalve 22 and engaging the outer side of the casing 39. 'A

than the plunger 44 projects therefrom through an aperture in block 46 and the extension 22a. The pin 44Hiis adapted to engage a valve member 22" of angular cro-ss section and which is illustrated as hexagonalv in cross section, said member 22,b being slidable in a bore in casing l22 and having a re cess at the end opposite pin 44a, which recess 4is filled with some rather soft material 22dl such as cork. The member 22c is threaded into the end of casing 22 and has a passage extending therethrough surrounded at' one end by a comparatively sharp flange 22d forming a valve seat with which the material 22d in valve 22b engages. The conduit 21 is coupled to one end of the member 22c by 'the usual threaded sleeve coupling andl the conduit l23 is similarly coupled to one side of the valve casing 22. The casing 29 has a removable cover 39a members 48 beneath said latter flange, thus'.

secured to the top l thereof. The casing 12 has angular members `48 secured at each end thereof having one forming guideways 50 into which a catch pan may beslid mto the casing 12 beneath the manifold 15 and burners 17. y

In operation the fuel in the tank 20 will be placed under pressure by pumping the air into said tank by means of a pump operated The fuel passes up into conduit 21 and the float 40 being in lts low position as shown in Fig. 3, thevalve lungerv 22"will be forced out of contact wit member 22". The fuel can thus pass through the member 22C, casing 22 and through conduit 23 to the vaporizing tube 18. The fuel also passes, under pressure, through conduit 33 will continue to heat tube 34 so that a blue or Bunsen flame will be maintained rising from the opening 35 and this flame will also 'extend upwardly and heat the vaporizing tube 18. After this flame'has operated for a short time, the hand wheel 19 may be turned to open the valve in vaporizing tube 18 and burner 17 adjacent hand wheel 19 may then be lighted. After the burner 17 is lighted, the valve in tube 34 may be closed by -hand wheel 34". The vaporized fuel passes through tube 18 into the mixing chamber 15a and air isV drawn into this mixing chamber through the opening 15b. The combustible v mixture thus formed passes through the pasi sage 15 to the burner 17. If it is desired to ignite the other burner 17, the hand wheel 1 b will be turned to permit the combustible mixture tov flow to said burner.

If for any reason the dame on the burner should become extinguished or the tube 34 should be left open so that fuel would be supplied to tube '34 or vaporizing tube 18, the stove would automatically be shut oil".

' Any unburned fuel passing into member 35 vwould overflow therefrom into the pan 15. vThis fuel would pass into the mixing chamberA and through opening. 15g to the bottom thereof and. would then flow int'o the memvber 37 and through conduit 38 to the float casing 39 and would accumulate therein. Any unburned fuel passing into the vaporizing tube 18 would also drip into the the mixlng chamber and pass through opening 15z to the bottom ofthe mixing chamber and intothe member 37.v This fuel would then pass through the conduit 38 to the float cas-v ing 39. vThe fuel accumulating in the float casing would. raise the floatv 4 0, thus raising the lever 41 and swinging block 45 towards casing 22. The plunger 44 would slide 1n the block 46 and the pin 44@t would pushv the member 22" a ainst member 22e. The cork or soft material insert in the p lunger 22"- would tightly close tA e passage 1n member 22. The fuel is thus shut oi from conduit 23 and no further fuel can then flow to vaporizing tube 18 or to the 'tube 34. No'

great amount of gasolinecould thus be furA i nished to the stove in an unburned condition and there is no danger of this unburned fuel evaporating and forming a combustible mixture of any appreciable volume. plunger 44 is made larger than the pin 44a to form a lgood guiding` surface to 'operate the slidable plunger Valve 221. The pluo 37 is constructed to stand some dista-nce a ove the bottom' of the manifold and the opening 37'a is provided therein so that there is always a draft upward through said plug. This prevents the combustible mixture in the manifold from passing out'through said plug and conduit 38 where it might collect and become ignited. It Will be lunderstood The y that the burners 17 create quite a draft' through the manifold. The pressure on the fuel in the tank' 20 will be indicated on the gauge 26 and the dept-h of the fuel will be shown on the depth gauge 20. A

From the above description it is seen that applicant has provided a very simple and lefficient structure of stove and'one having means for positively shutting olif. the fuel supply when the. stove burners are extingulshed Vwithout the supply of fuel being 'turned ofl' or whenA the suppl)T of fuel is turned on without the burners being lighted. The stove is thus safe and there is no danger of an explosion caused by a large volume of combustible mixture being formed adjacent the same. The parts of, the device are quite few and simple in construction. The stove is quite rugged in construct-ion. The same `has been amply demonstrated in ac,- tual practice and found to be'very successful and eliicient.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicants invention. which, generally stated, consists in a deviceI capable of carrying out the objects above set forth, in thenovel ,parts and combinations of parts disclosed land defined in the appended claims.

" What is claimed is i 1. A stove adapted to use liquid Vaporizing fuel having in combination, a fuel tank, a burner, a mixing chamber for supplying a, combustible mixture to said burner, a member. supplying fuel to said mlxing. chamber and burner, a manually operated valve regulating the supply pf fuel to said member, an auxiliary starting burner of the retort type, means for supplying fuel there-to, a manually operated valve controlling the supply of fuel to said auxiliary burner, and automatic means operated by liquid fuel for shutting off the supply of `fuel from said fuel tank if either of said manually operated valves-are left open with its respective burn- .er notl ignited.

2. A stove adapted to use liquid vaporizping fuel having in combination, .a fuel tank, a main burner, means comprising a man- -ually operated valve for controlling the 'supply of "felto said burner, an auxiliary vburner of-the retort type, mea-ns comprising a manually operated valve for controlling the supply o'f fuelto said auxiliary burner,

Y a` conduit for supplying fuel from said tank "to both of said means, a valve in said concombustible mixture to said burner, means comprising a manually controlled valve for supplying fuel to said mixing chamber, a float chamber, means for collecting unburned fuel and directing'the same into said mixing .'chamber, a member having an open upper end in said mixing chamber extending above the bottom thereof and having a chamber therein, and having an opening into said chamber substantially lflush With the bottom of said mixing chamber, a conduit connecting said member to said float chamber, a conduit for supplying fuel to said last men tioned means, a valve in said last mentioned conduit, and means connected to said ffloat andA said last mentioned valve for closing said last mentioned' valve when liquid fuel accumulates in said float chamber.

4. A stove adapted to use liquid Vaporizing fuel having in combination, a fuel tank,- a burner, a mixing chamber for supplying a combustiblemixturc' to said burner, a conduit for supplying fuel from said tank to said mixing chamber, a. float chainber,a float in said chamber, a conduit for conveying unburned fuel from said mixing chamber to said float chamber, la tubular member communicating with said conduit having an' open end disposed 'an appreciable distance above the floor of said mixing chamber and having an .opening there'into substantially ush with the floor of said mixing chamber, whereby a draft is caused upward in said member preventing the How of combustible mixture to said float chamber, and means adapted to be actuated by said float for shutting of said first memtioned conduit upon` accumulation of liquid fuel insaid lioat chamber.

5. A stove adapted to use liquid vaporizing fuel, having in combination a frame, a fuel tank carried thereon, a manifold comprising a chambery burners carried'v table or similar sup on said manifold, a vaporizing tube for supplying fuel to said mixin chamber and burners, an auxiliary starting burner disposed b'elowpsaid vaporizing tube, a conduit vconnected to said tank and to said Vaporizing tube and auxiliary burner, a receptacle disposed beneath said auxiliary burner and at the top of said manifold having a drain means, 'a Hoat chamber on said frame, a conduit connecting said ioat chamber to the bottom of said mixing chamber, said drain means communicating with said mixing chamber and last mentioned conduit, a float in sai-d float chamber, a valve in Said first mentioned conduit, for shutting off ythe supply of fuel from said tank to said vaporizf ing tube or auxiliary burner, and means connected to said float and to said valve for positively moving the same to open or closed position.

6. A stove adapted to use liquid vaporia-fing fuel having in combination, a frame, a fuel tank carried thereon, a manifold com-y risinga mixing chamber and a plurality of ing chamber, a float chamber carried on said frame, a conduit leading from the bottom of ksaid mixing chamber to said float chamber,

a valve in said first mentioned conduit for shutting ofthe supply of fuel'to said vaporizing tubeand auxiliary'burner, and means connected to said float and to said valve for positively moving the same to closed and open position respectively as said float rises or falls.

7. A stove adapted to be supported on a port having inv combination, a frame comprising a top plate having .a `plurality of openings therein, a fuel tank supported atene end of said frame, a manifo d comprising a mixing chamber, main b urners connected to said manifold and ver- -tically alined with said openings,'a Vaporizing tube. extending across the topn of the main burner nearest said tank, the conduit connecting said Vaporizing tube and tank, al

manually operated valve controlling said conduit, an auxiliary starting burner'disf -p'osed beneathsaid vaporizing tube at one side of said main burner, a small conduit extending to said auxiliary burner, a manuallyoperated valve for controllingl said last .Y

mentioned. conduit, a conduit connectingl a float chamber on said frame,-

said conduits,

a fioat therein, a valve controlled by said oat for closing said firstv mentioned oonduit, a drain conduit leading from saidinanifold to said float chamber, and a drain tube, an auxiliary starting burner of the-remeans extending from said auxiliary burner tort type for said burner, means for supplyto said manifold. f J ing fuel to said auxiliary burner, a shut-0 y 8.- A stove adapted tovuseliquid vaporiz- Valve for said auxiliary burner and. autog fuel having in-combination, alfuel tank, matic means 'operated by liquid fuel for a manifold comprising a mixing chamber, shutting off the supply of fuel from said a burner to which a combustible mixture is fuel'tank if either of said shutofl` valves are su plied from said; manifold, a vaporizin'g left open with its respective burner not igtu e for supplying fuel to said mixing nited.

- chamber, a conduit-connecting said tankand I n testimony whereof I aiix` my signature.

vaporizing tube for'l supplying fuel to the` latter, a shut-off valve for saidvaporizing l HANS C. HANSON'. 

